superposition of binary image contours on grid level image 255

I need to draw a yellow line from the binary image contours I have this image

I made a work to detect urban spot then I want to draw yellow line of the last picture contours as the following picture

Answer 1

[Image Analyst]

Try this

% Get boundaries of the regions in the binary image.
boundaries = bwboundaries(binaryImage);
% Display those boundaries over the original image
hold on; % Don't blow away existing displayed image.
visboundaries(boundaries, 'Color', 'y');  % Display outline.
hold off;

If you have an antique version of MATLAB, use the following code to display the boundaries instead of visboundaries():

% Get boundaries of the regions in the binary image.
boundaries = bwboundaries(binaryImage);
numberOfBoundaries = size(boundaries, 1);
hold on;
for k = 1 : numberOfBoundaries
  thisBoundary = boundaries{k};
  plot(thisBoundary(:,2), thisBoundary(:,1), 'y', 'LineWidth', 2);
end
hold off;

Answer 2

[Walter Roberson]

http://www.mathworks.com/help/images/ref/bwboundaries.html can be used to find the locations of the boundary pixels.

You might also be interested in http://www.mathworks.com/matlabcentral/fileexchange/32112-mask2poly

Answer 3

[Abdou Abdou]

Thank you very much I arrived to resolve because of you

[Image Analyst]

You're very welcome. The usual thing we do in this forum to thank people is to "Accept this answer" to give the person reputation points (not that I need anymore, but that is the custom).